Coil mounting for high frequency systems



a March 20, 1934.

L. A. HYLAND COIL MOUNTING FOR HIGH FREQUENCY SYSTEMS FiledFeb. 6, 1932.

INVENTOR Lawrence A. Hyland BY ATTORNEY Patented Mar. 20, 1934 COIL MOUNTING FOR HIGH FREQUENCY SYSTEMS Lawrence A. Hyland, Washington, D. 0.

Application February 6, 1932, Serial No. 591,443

1 Claim.

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) This invention relates to improvements in coil mountings for high frequency systems, and more particularly to a plug-in coil mounting for systems using thermionic tubes.

One of the objects of this invention is to provide a plug-in coil mounting in combination with the plug-in contacts of a thermionic tube used in connection with said coil.

Another object of this invention is to provide a thermionic tube and a coil system in combination in such a manner that the shortest leads may be provided between the ends of the coils and the electrodes of said tube.

Another object of this invention is to provide a compact and efficient structure comprising a thermionic tube and a plurality of coils in which the losses of the inter-connecting leads are reduced to a minimum.

These objects are attained by providing coils on the base of a thermionic tube and connecting these coils in circuit in the desired manner with the elements of the tube.

The invention may now be more fully understood by reference to the following description when read in connection with the accompanying drawing, in which Fig. 1 is a view in perspective showing the tube and coils. Fig. 2 is a diagrammatic view illustrating one manner of interconnecting the coil and tube elements.

In all high frequency systems the problem of the length of connecting wires is of great importance. compactness is desired not only for the conservation of space, but to provide for efiicient operation of the equipment. Plug-in coil systems are desirable in order to permit the rapid change of the frequency that may be obtained, yet the losses resulting from such systems are often so serious as to interfere with their use. The device disclosed herein employs a winding or a plurality of windings on the base of the tube associated therewith. The winding or windings may be connected directly to either the wires leading to the interior of the tube or to the plugin terminals leading to the other elements of the set. The tube base must be of the low-loss insulation type employing such materials as those that are known in the art as victron, pyrex, isolantite, or an equivalent low-loss insulation. Any desirable combination of coil structure may be employed. The advantages of the scheme lie in the fact that one set of plug-in terminals is eliminated and the leads are materially shortened. Experience has shown that oscillation and eflicient operation may be obtained at higher frequencies than is possible with any other type of construction.

In the drawing, 1 is the usual glass shell containing the elements of a thermionic tube; 2 is the base thereto which is made of an insulating Q0 material having low loss properties. 3 is one of the windings of the coil system and is associated with or connected in the grid circuit of the tube. 4 is a second coil mounted on the base adjacent to and coupled with the coil 3. The a coil 4.- may be associated with or connected in the plate circuit or the tube. The terminals or plug members 5 are connected with the leads from the coils and the elements of the tube.

In the embodiment illustrated two coils are 7 provided, one of which may be connected in the circuit between the grid and the filament of the tube and the other of which may be connected in the circuit between the plate and filament of the tube. These connections may be made directly to the wires leading to the elements of the tube or plug-in terminals 5 that connect by means of an associated jack or socket the various coils and elements in proper circuit arrangement.

With the structure illustrated, it will be apso parent that only one set of plug-in contacts is required for the tube and the coil elements. With this structure, it may be seen that the effective inductance and distributed capacity of the coils may be so proportioned to the capacities of the tube elements as to permanently fix the frequency thereof at a desired value.

It will be understood that the above description and accompanying drawing comprehend only the general and preferred embodiment of my invention, and that various changes in construction, proportion and arrangement of parts may be made within the scope of the appended claim Without sacrificing any of the advantages of this invention.

The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment of any royalties thereon.

I claim:

The combination of a vacuum tube having a grid, a filament, a plate, a base, a coil system concentrically mounted on said base comprising a plurality of mutually coupled coils one of which is connected in circuit between the grid and the filament and the other of which is connected in circuit between the plate and filament.

LAWRENCE A. HYLAND. 

